Specifications

Section 7. Measurement Instructions
Parameter
& Data Type
Enter
TRef
Variable
The name of the variable that is the reference temperature for the thermocouple
measurements.
RevDiff Code Value
Result (Reversing requires twice as much time to complete)
Constant False 0
Signal is measured with the high side referenced to the low
True ≠0
A second measurement is made after reversing the inputs to cancel
offsets
MeasOfs
Constant
Code Value
Result the Ground offset voltage is subtracted from single
ended measurements.
False 0
Offset voltage is corrected from background calibration
True ≠0
Offset voltage is measured each scan
SettlingTime
Constant
The time in microseconds to delay between setting up a measurement (switching to the
channel, setting the excitation) and making the measurement. (1 microsecond resolution)
Entry
Voltage Range Integration Settling Time
0
All 250 µS 450 µS (default)
0
All _50Hz, _60 Hz 3 mS (default)
>=100
All All µS entered
Integ The time spent on integration in microseconds for each of the channels measured.
Constant Entry
Integration
250
250 µS
_60Hz or 16667
16,667 µS (reject 60 Hz noise)
_50 Hz or 20000
20,000 µS (reject 50 Hz noise)
Mult, Offset
Constant,
Variable,
Array, or
Expression
A multiplier and offset by which to scale the raw results of the measurement. See the
measurement description for the units of the raw result; a multiplier of one and an offset
of zero are necessary to output in the raw units. For example, the TCDiff instruction
measures a thermocouple and outputs temperature in degrees C. A multiplier of 1.8 and
an offset of 32 will convert the temperature to degrees F.
7.3 Half Bridges
BrHalf (Dest, Reps, Range, SEChan, ExChan, MeasPEx, ExmV, RevEx,
SettlingTime, Integ, Mult, Offset)
X = result w/mult = 1,
offset = 0
X
V
V
R
RR
x
s
sf
==
+
1
This Instruction applies an excitation voltage, delays a specified time and then makes a
single ended voltage measurement. The result with a multiplier of 1 and an offset of 0 is
the ratio of the measured voltage divided by the excitation voltage.
7-5